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std.io.Writer: add writeFile method

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This commit is contained in:
Andrew Kelley 2024-03-06 18:35:04 -07:00
parent 574b33e65a
commit b7ba0b69b1
1 changed files with 11 additions and 0 deletions
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11
lib/std/io/Writer.zig
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@ -58,3 +58,14 @@ pub fn writeStruct(self: Self, value: anytype) anyerror!void {
comptime assert(@typeInfo(@TypeOf(value)).Struct.layout != .Auto);
return self.writeAll(mem.asBytes(&value));
}
pub fn writeFile(self: Self, file: std.fs.File) anyerror!void {
// TODO: figure out how to adjust std lib abstractions so that this ends up
// doing sendfile or maybe even copy_file_range under the right conditions.
var buf: [4000]u8 = undefined;
while (true) {
const n = try file.readAll(&buf);
try self.writeAll(buf[0..n]);
if (n < buf.len) return;
}
}